If the person they have under arrest is not the perpetrator, the police might want to hunt down the two Asiatics seen in this photograph.

Regarding the uncertainty about the perpetrator, I have to say I found it very strange the way German authorities continually insisted that no one should upload photos or videos of the incident to the internet, only send them privately to the police. It's almost enough to make me listen to the Alex Jones show to see if he's got any interesting "theories" about it.

I have seen online a video done soon as the attack took place, and the people behind the camera speak in arabic, everyone around them seemed to be desperate and in a rush to save people, but for them it was just another day, they seem to be pretty ok as they film the aftermath http://theync.com/terror-attack-germany.htm